My Free Flight aircraft selection window, as well as my main flight windows both have a square green box in the top left corner of the display. This happens for all aircraft on all views.

Has anyone had experience with this before? Perhaps someone may have an idea where this is coming from and how I can get rid of it.

In Nvidia Inspector set Toggle FXAA Indicator to off: you must have it on. This setting AA's the aircraft selection screen but the side effect is the green square. Switching it off will remove said square.

Cheers,

Mark

Thank you Mark for the quick and very simple solution!